JPH051073B2 - - Google Patents
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- Publication number
- JPH051073B2 JPH051073B2 JP63071766A JP7176688A JPH051073B2 JP H051073 B2 JPH051073 B2 JP H051073B2 JP 63071766 A JP63071766 A JP 63071766A JP 7176688 A JP7176688 A JP 7176688A JP H051073 B2 JPH051073 B2 JP H051073B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- classification
- classification chamber
- diameter
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000843 powder Substances 0.000 claims description 99
- 239000000463 material Substances 0.000 claims description 37
- 238000007599 discharging Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 description 34
- 239000006185 dispersion Substances 0.000 description 10
- 238000010298 pulverizing process Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Cyclones (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は分級室に供給した粉体材料に高速旋回
渦流を生起させて微粉と粗粉とに遠心分離させる
気流分級機に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air classifier that generates a high-speed swirling vortex in a powder material supplied to a classification chamber to centrifugally separate it into fine powder and coarse powder.
［従来の技術］
従来、気流分級機としては、井伊谷式分級機
（日本機械学会誌59［３］215（昭31）やクラシク
ロン（名古屋工業技術試験所報告８［４］235（昭
34）等が考案されているが、これらはその固有の
形状で分離粒子径が決まり、分離粒子径を調整す
ることができない。また粉体材料を１点から分級
室へ供給する方法であり、分散が悪く、かつ材料
供給速度が上がると著しく分級精度の低下と分離
粒子径が大きくなる等の欠点を有している。[Conventional technology] Conventionally, air classifiers include the Iitani type classifier (Journal of the Japan Society of Mechanical Engineers 59 [3] 215 (Showa 31) and the Clacyclon (Nagoya Institute of Technology Report 8 [4] 235 (Showa 31)).
34), etc. have been devised, but in these, the separated particle size is determined by the unique shape of the particle, and the separated particle size cannot be adjusted. Furthermore, this is a method of supplying the powder material from one point to the classification chamber, which has drawbacks such as poor dispersion and a marked decrease in classification accuracy and an increase in the separated particle size as the material supply rate increases.
この解決手段として特開昭54−48378号公報の
ごとく分級室の高さを調節可能にする方法、特開
昭54−79870号公報のごとく分級室上にサイクロ
ン形状の案内筒を取り付ける方法が提案されてお
り、これらの提案を組み合わせたものが実用化さ
れている。この実用化されている気流分級機の形
状を第８図及び第９図に示す。 As a solution to this problem, a method has been proposed in which the height of the classification chamber can be adjusted as in JP-A No. 54-48378, and a method in which a cyclone-shaped guide tube is attached above the classification chamber as in JP-A-54-79870. A combination of these proposals has been put into practical use. The shape of this air classifier that has been put into practical use is shown in FIGS. 8 and 9.
［発明が解決しようとしている課題］
しかし、第８図及び第９図に示したようなこの
種の気流分級機では、処理量を多くするために分
級室の径を大きくしたものでは、分離粒子径の下
限が大きくなつてしまうという欠点があつた。[Problem to be solved by the invention] However, in this type of air classifier as shown in Figs. 8 and 9, in which the diameter of the classification chamber is increased in order to increase the throughput, the separated particles The disadvantage was that the lower limit of the diameter was large.
そこで、実開昭54−122477号公報に記載されて
いるように、案内板の径を大きくすることによつ
て、供給溝の径を大きくし微粉排出口７までの距
離を大きくとることができるため、微粉排出口７
より排出される微粉中に粗粉が混入するのを防
ぎ、微粉の平均粒子径を小さくすることが提案さ
れている。 Therefore, as described in Japanese Utility Model Application Publication No. 54-122477, by increasing the diameter of the guide plate, the diameter of the supply groove can be increased and the distance to the fine powder discharge port 7 can be increased. Therefore, fine powder outlet 7
It has been proposed to prevent coarse powder from being mixed into the fine powder that is discharged, and to reduce the average particle size of the fine powder.
しかしながら、この提案では分級室内での粉体
材料の分散が不十分であり、粗粉中には、微粉の
凝集物が混入するため、分級効率の低下を起こし
ており、処理量を多くするという当初の目的から
逸脱してしまうという欠点があつた。 However, in this proposal, the dispersion of the powder material in the classification chamber is insufficient, and fine powder aggregates are mixed into the coarse powder, resulting in a decrease in classification efficiency and the need to increase the throughput. The drawback was that it deviated from its original purpose.
［課題を解決するための手段］
本発明の目的は、上記問題を解消した気流分級
機を提供するものである。[Means for Solving the Problems] An object of the present invention is to provide an air classifier that solves the above problems.
具体的には、本発明の目的は、分級室の上部に
中央部が高くなる傾斜状の案内板を設け、該案内
板の下縁外周囲に粉体材料を分級室に供給するた
めの供給溝を形成し、該分級室の下部には中央部
が高くなる傾斜状の分級板を設け、該分級板の下
縁外周囲には風力分級された粗粉を排出するため
の粗粉排出口を形成し、該分級板の中央部には風
力分級された微粉を排出するための微粉排出口が
具備されており、該案内板の径を大きくすること
によつて供給溝の径を大きくし、微粉排出口の口
径が分級板の外直径に対して10％以上25％以下で
あり、
該分級室の上部周囲には、供給された粉体材料
をエアの旋回流により分散させるために、分級室
上部に外気からエアを導入するための第１空気流
入口を有する流入路を複数のルーバーで形成して
いる第１空気流入手段が具備されており、
該分級室の下部周囲には、分散された粉体材料
を風力分級するためのエアの旋回流を生じさせる
ために、分級室下部に外気からエアを導入するた
めの第２空気流入口を有する流入路を複数のルー
バーで形成している第２空気流入手段が具備され
ていることを特徴とする気流分級機を提供するこ
とにある。 Specifically, an object of the present invention is to provide an inclined guide plate with a high central part at the upper part of the classification chamber, and to supply powder material to the classification chamber around the lower edge of the guide plate. A groove is formed, and an inclined classification plate with a high central part is provided at the bottom of the classification chamber, and a coarse powder discharge port is provided around the lower edge of the classification plate for discharging coarse powder classified by wind. The central part of the classification plate is equipped with a fine powder discharge port for discharging the fine powder classified by wind, and by increasing the diameter of the guide plate, the diameter of the supply groove can be increased. , the diameter of the fine powder outlet is 10% or more and 25% or less of the outer diameter of the classification plate, and there is a space around the upper part of the classification chamber in order to disperse the supplied powder material by a swirling flow of air. A first air inflow means is provided in the upper part of the classification chamber, and includes a plurality of louvers forming an inflow passage having a first air inlet for introducing air from outside air, and around the lower part of the classification chamber, In order to generate a swirling flow of air for wind-classifying the dispersed powder material, a plurality of louvers form an inlet passage having a second air inlet for introducing air from outside air into the lower part of the classification chamber. An object of the present invention is to provide an air classifier, characterized in that it is equipped with a second air inflow means.
さらに、本発明の目的は、分級室の上部に中央
部が高くなる傾斜状の案内板を設け、該案内板の
下縁外周囲に分級室に粉体材料を供給するための
供給溝を形成し、該分級室の下部には中央部が高
くなる傾斜状の分級板を設け、該分級板の下縁外
周囲には風力分級された粗粉を排出するための粗
粉排出口を形成し、該分級板の中央部には風力分
級された微粉を排出するための微粉排出口が具備
されており、該案内板の径を大きくすることによ
つて供給溝の径を大きくし、該分級板の傾斜角度
を30゜以上60゜以下にし、
該分級室の上部周囲には、供給された粉体材料
をエアの旋回流により分散させるために、分級室
上部に外気からエアを導入するための第１空気流
入口を有する流入路を複数のルーバーで形成して
いる第１空気流入手段が具備されており、
該分級室の下部周囲には、分散された粉体を風
力分級するためのエアの旋回流を生じさせるため
に、分級室下部に外気からエアを導入するための
第２空気流入口を有する流入路を複数のルーバー
で形成している第２空気流入手段が具備されてい
ることを特徴とする気流分級機を提供することに
ある。 Furthermore, it is an object of the present invention to provide an inclined guide plate with a high central portion at the top of the classification chamber, and to form a supply groove around the lower edge of the guide plate for supplying powder material to the classification chamber. In the lower part of the classification chamber, there is provided a slanted classification plate with a high central part, and a coarse powder discharge port is formed around the lower edge of the classification plate for discharging coarse powder classified by air. , the central part of the classification plate is equipped with a fine powder discharge port for discharging the fine powder classified by wind, and by increasing the diameter of the guide plate, the diameter of the supply groove is increased, and the classification plate is The angle of inclination of the plate is 30° or more and 60° or less, and air is introduced from outside into the upper part of the classification chamber in order to disperse the supplied powder material by swirling air flow around the upper part of the classification chamber. A first air inlet means is provided in which a plurality of louvers form an inlet passage having a first air inlet, and a first air inlet means is provided around the lower part of the classification chamber for wind-classifying the dispersed powder. In order to generate a swirling flow of air, a second air inlet means is provided in which a plurality of louvers form an inlet passage having a second air inlet for introducing air from outside air into the lower part of the classification chamber. An object of the present invention is to provide an air classifier characterized by the following.
本発明によれば、案内板の径を大きくすること
により供給溝の径を大きくすること、そして、分
級室上部外周囲に粉体材料を旋回流により分散さ
せるための第１空気流入手段を設けること、さら
に、前記手段に加えて、微粉排出の口径を、分級
板の外直径に対して10％以上25％以下にするこ
と、より好ましくは20％以上25％以下にすること
により、および／または、分級板の傾斜角度を
30゜以上60゜以下にすること、より好ましくは40゜以
上50゜以下にすることにより、精度良く分離粒子
径の小さな分級を効率良く行うことができるよう
にしたものである。 According to the present invention, the diameter of the supply groove is increased by increasing the diameter of the guide plate, and the first air inflow means is provided for dispersing the powder material by swirling flow around the upper part of the classification chamber. Furthermore, in addition to the above means, by setting the diameter of the fine powder discharge to 10% or more and 25% or less, more preferably 20% or more and 25% or less of the outer diameter of the classification plate, and/ Or, change the inclination angle of the classification plate.
By setting the angle to 30° or more and 60° or less, more preferably 40° or more and 50° or less, it is possible to efficiently classify particles with a small diameter with high precision.
以下、図面に基づいて詳細に説明する。 A detailed description will be given below based on the drawings.
本発明による気流分級機の一例として、外表面
図として第１図及び縦断正面図として第２図に示
す形のものを例示し得る。 As an example of the air classifier according to the present invention, one having the shape shown in FIG. 1 as an external surface view and FIG. 2 as a vertical front view can be exemplified.
図中、１は本体ケーシング、２は該ケーシング
１の下部に接続した下部ケーシングであつて、そ
の下部にホツパー３とを備え、本体ケーシング１
の内部には分級室４が形成されている。本体ケー
シング１の上部に案内筒１０が起立し、この案内
筒１０の上部外周囲に供給筒９が接続されてい
る。案内筒１０内の下部に中央が高くなる傾斜状
の案内板１５を取り付け、この案内板１５の下縁
外周囲に環状の供給溝１１を形成する。 In the figure, 1 is a main casing, 2 is a lower casing connected to the lower part of the casing 1, and is equipped with a hopper 3 at the lower part, and the main casing 1
A classification chamber 4 is formed inside. A guide tube 10 stands up on the upper part of the main body casing 1, and a supply tube 9 is connected to the upper outer periphery of the guide tube 10. An inclined guide plate 15 with a high center is attached to the lower part of the guide tube 10, and an annular supply groove 11 is formed around the lower edge of the guide plate 15.
ここで、案内板１５の径を大きくし、その下縁
外周囲、つまり供給溝１１は、本体ケーシング１
の内壁に隣接させ、分級室４の最外周部とする。 Here, the diameter of the guide plate 15 is increased, and the outer periphery of its lower edge, that is, the supply groove 11 is
It is located adjacent to the inner wall of the classification chamber 4, and is the outermost part of the classification chamber 4.
また、分級室４の底部には、中央部が高くなる
傾斜状の分級板５を設け、この分級板５の下縁外
周囲に環状の粗粉排出溝６を形成し、分級板５の
中央部には微粉排出口７を形成する。 Further, at the bottom of the classification chamber 4, there is provided an inclined classification plate 5 with a higher central part, and an annular coarse powder discharge groove 6 is formed around the lower edge of the classification plate 5. A fine powder discharge port 7 is formed in the part.
分級室４の下部周壁外周囲には、第２空気流入
口８が具備されており、この第２空気流入口８
は、第４図に示すように通常複数個の羽根形状の
分級ルーバー１４の間隙により構成されている。
第２空気流入口８より導入される空気の流れは、
分級室４に旋回しながら下降する粉体材料の旋回
方向に噴出するように分級ルーバー１４により調
整し、粉体材料を分散させ、かつ旋回速度を加速
させている。 A second air inlet 8 is provided around the outer circumference of the lower peripheral wall of the classification chamber 4.
As shown in FIG. 4, the louvers are usually formed by gaps between a plurality of blade-shaped classification louvers 14.
The flow of air introduced from the second air inlet 8 is as follows:
The classification louver 14 is adjusted so that the powder material descending while swirling into the classification chamber 4 is ejected in the swirling direction, thereby dispersing the powder material and accelerating the swirling speed.
さらに、分級室４の上部周壁外周囲には、供給
された粉体材料を分散するためのエアを外気から
導入するための第１空気流入口１２を有する流入
路が具備されている。該第１空気流入口１２は、
複数個の羽根形状の分散ルーバー１３の間〓によ
り構成されている。第３図に、第１図、第２図の
−視断面図を示すが、この第３図に示すよう
に第１空気流入口１２より導入される空気の流れ
は、案内筒１０の内部外周囲を施回しながら下降
し、環状の供給溝１１より分級室４内に旋回流入
する粉体材料の旋回方向に噴出するように、分散
ルーバー１３により調整される。 Furthermore, an inlet passage having a first air inlet 12 for introducing air from the outside air for dispersing the supplied powder material is provided around the outer circumference of the upper peripheral wall of the classification chamber 4. The first air inlet 12 is
It is constituted by a space between a plurality of vane-shaped dispersion louvers 13. FIG. 3 shows a cross-sectional view taken from the side in FIGS. 1 and 2. As shown in FIG. It is adjusted by the dispersion louver 13 so that it descends while wrapping around the surroundings and is ejected in the swirling direction of the powder material that swirls and flows into the classification chamber 4 from the annular supply groove 11 .
第１空気流入口１２および第２空気流入口８の
断面積、つまり、分級ルーバー１４間の間隔およ
び分散ルーバー１３間の間隔また、それぞれのル
ーバーの高さは、適宜に設定する。 The cross-sectional area of the first air inlet 12 and the second air inlet 8, that is, the interval between the classification louvers 14 and the interval between the dispersion louvers 13, and the height of each louver are set as appropriate.
本発明の構成によると、従来の装置よりも案内
板１５の径を大きくすることによつて、環状の供
給溝１１の径を大きくし微粉排出口７までの距離
を大きくすることができるため、微粉排出口７よ
り排出される微粉中に粗粉が混入するのを防止し
分離微粉の平均粒子を小さくした。同時に、案内
筒内壁で遠心力により濃縮されて環状の供給溝１
１から分級室４内に旋回流入する粉体材料を分級
室上部の第１空気流入口１２より流入する空気に
より分散し、かつその旋回力を加速して、分級室
下部へ旋回落下させ、分級室下部においては、第
２空気流入口８より流入する空気により旋回速度
をさらに加速させて、粗粉と微粉とに効率良く分
級させる。 According to the configuration of the present invention, by making the diameter of the guide plate 15 larger than that of the conventional device, the diameter of the annular supply groove 11 can be increased and the distance to the fine powder discharge port 7 can be increased. The coarse powder is prevented from being mixed into the fine powder discharged from the fine powder discharge port 7, and the average particle size of the separated fine powder is reduced. At the same time, it is concentrated by centrifugal force on the inner wall of the guide cylinder, and the annular supply groove 1
The powder material that swirls and flows into the classification chamber 4 from 1 is dispersed by the air that flows in from the first air inlet 12 at the top of the classification chamber, and the swirling force is accelerated to make it swirl and fall to the bottom of the classification chamber for classification. In the lower part of the chamber, the swirling speed is further accelerated by the air flowing in from the second air inlet 8 to efficiently classify the powder into coarse powder and fine powder.
この分級室４内の粉体材料の分散状態が分散性
能に非常に影響を及ぼすが、従来の装置ではこの
分散が不十分であつた。本発明では、分級室上部
に第１空気流入口１２を設けることにより粉体材
料の分散を十分に行いかつ分級室４内での旋回速
度を増すことにより、前記した大きな案内板によ
る効果とともに分離粒子径を著しく小さくし、粒
度分布（粒径−重量頻度分布、以下単に粒度分布
と記す）の狭い精緻は分級製品を得ることを可能
にした。 The state of dispersion of the powder material in the classification chamber 4 has a great influence on the dispersion performance, but this dispersion has been insufficient in conventional devices. In the present invention, by providing the first air inlet 12 in the upper part of the classification chamber, the powder material is sufficiently dispersed, and by increasing the rotation speed within the classification chamber 4, the separation is achieved in addition to the effect of the large guide plate described above. Remarkably reducing the particle size and narrowing the particle size distribution (particle size-weight frequency distribution, hereinafter simply referred to as particle size distribution) made it possible to obtain classified products.
分級室上部に設ける第１空気流入口１２は、分
級室４の全高の中央より上部に設け、環状の供給
溝１１の下に設けるのが好ましい。 The first air inlet 12 provided in the upper part of the classification chamber is preferably provided above the center of the overall height of the classification chamber 4 and below the annular supply groove 11.
空気流入口１２より流入する空気の風速は、分
級室下部の第２空気流入口８より流入する空気の
風速と同等もしくは遅い速度になるように調整す
ることが好ましい。これは、第１空気流入口１２
より流入する空気は、粉体材料を分散させること
を主目的としており、粉体材料に強い旋回力を与
え遠心力の違いにより粗粉と微粉とに分級するた
めの空気流は、分級室下部の第２空気流入口８よ
り導入させる空気から得ているためである。 The wind speed of the air flowing in through the air inlet 12 is preferably adjusted to be equal to or slower than the wind speed of the air flowing in through the second air inlet 8 at the lower part of the classification chamber. This is the first air inlet 12
The main purpose of the air flowing in is to disperse the powder material, and the air flow that gives the powder material a strong swirling force and classifies it into coarse powder and fine powder due to the difference in centrifugal force is directed to the lower part of the classification chamber. This is because the air is obtained from the air introduced from the second air inlet 8.
さらに、微粉排出口７の口径を微粉排出管１６
の内径よりも狭く、分級室５の外直径に対して10
％以上25％以下にすることにより、分級板５の外
周から微粉排出口７までの距離を大きくするた
め、よりいつそう分離微粉中への組粉の混入を防
ぎ、分離微粉の平均粒子径をさらに小さくすると
同時にその粒度分布もより精緻なものにすること
を可能にした。 Furthermore, the diameter of the fine powder discharge port 7 is changed to the fine powder discharge pipe 16.
narrower than the inner diameter of the classification chamber 5, and 10% smaller than the outer diameter of the classification chamber 5.
% to 25%, the distance from the outer periphery of the classification plate 5 to the fine powder discharge port 7 is increased, which more easily prevents the mixture of powder into the separated fine powder and reduces the average particle diameter of the separated fine powder. This made it possible to make the particles even smaller and at the same time to make the particle size distribution more precise.
微粉排出口７の口径は、分級板５の外直径に対
して20％以上25％以下にすることがより好まし
く、より狭くした場合には圧力損失が大きくなる
ため、微粉排出管１６を通過する空気量が減少
し、第１空気流入口１２及び第２空気流入口８か
ら流入する分散および旋回を起こす空気を減らし
てしまう。 It is more preferable that the diameter of the fine powder discharge port 7 is 20% or more and 25% or less of the outer diameter of the classification plate 5. If it is made narrower, the pressure loss will increase, so the diameter of the fine powder discharge port 7 is preferably set to 20% or more and 25% or less of the outer diameter of the classification plate 5. The amount of air decreases, and the amount of air flowing in from the first air inlet 12 and the second air inlet 8 that causes dispersion and swirling is reduced.
また、分級板５の傾斜角度を30゜以上60゜以下に
することによつても、分級板５の外周から微粉排
出口７までの距離を大きくすることができるた
め、微粉排出口７の口径を小さくするのと同様の
効果が得られる。 Furthermore, by setting the inclination angle of the classification plate 5 to 30° or more and 60° or less, the distance from the outer periphery of the classification plate 5 to the fine powder discharge port 7 can be increased, so that the diameter of the fine powder discharge port 7 can be increased. The same effect can be obtained by reducing .
本発明の装置を第１０図のフローチヤートに示
すように粉砕機と連結させた粉砕−分級システム
として用いると特に効果的である。 The apparatus of the present invention is particularly effective when used as a grinding-classifying system coupled to a grinder as shown in the flowchart of FIG.
この場合、まず本発明の気流分級機に粉砕原料
を供給し、規定粒度以上の粗粉は粉砕機へ導入
し、粉砕後再度気流分級機に循環させる。規定粒
度以上の微粉は、気流分級機から取り出し粉砕品
とする。 In this case, first, the pulverized raw material is supplied to the air classifier of the present invention, and the coarse powder having a specified particle size or more is introduced into the pulverizer, and after being pulverized, it is circulated to the air classifier again. Fine powder with a specified particle size or higher is removed from the air classifier and made into a pulverized product.
このような粉砕システムにおいて、第８図及び
第９図に示したような従来の気流分級機では、粉
砕処理量を多くするため、分級機本体を大きくし
た場合、分離粒子径を小さくすることができず、
粉砕品粒径の下限が大きくなつてしまつていた。
また、この従来例の気流分級機の案内板１５の径
を大きくし、供給溝の径を大きくしただけの気流
分級機では、粉砕品の平均粒径（粉径−重量分布
のメジアン値粉径で例えばコールターエレクトロ
ニクス社製コールターカウンターで測定させる。
以下、単に平均粒径と記す。）を小さくすること
はできるが、分級室内での粉体の分散が不十分で
あるため、極微粒子で構成される凝集体あるいは
粗粉に付着している微粒子を完全にほぐすことが
困難でかる。また、かかる凝集体は分級機で粗粉
側に混入し、粉砕機に再度循環されるため、過粉
砕を引き起こし粉砕効率の低下を招くとともに、
粉砕品は微細粒子が多く幅広い粒度分布になつて
しまつていた。 In such a crushing system, in the conventional air classifier shown in Figures 8 and 9, if the size of the classifier body is increased in order to increase the amount of crushing, it is difficult to reduce the separated particle size. I can't do it,
The lower limit of the particle size of the pulverized product had become large.
In addition, in this conventional air classifier, the diameter of the guide plate 15 is increased and the diameter of the supply groove is increased. For example, the measurement is performed using a Coulter Counter manufactured by Coulter Electronics.
Hereinafter, it will simply be referred to as average particle size. ) can be made smaller, but because the powder is not sufficiently dispersed in the classification chamber, it is difficult to completely loosen aggregates made up of ultrafine particles or fine particles attached to coarse powder. . In addition, such aggregates mix into the coarse powder side of the classifier and are circulated to the pulverizer again, causing over-pulverization and reducing the pulverization efficiency.
The crushed product contained many fine particles and had a wide particle size distribution.
このような問題に対し、本発明の分級機を用い
た場合、粉砕品粒子径をより小さくし、かつ分級
室内の粉体の分散が十分に行われるため、かかる
凝集体をほぐすことができ微粉は微粉として分級
されるので粉砕効率をより向上させることができ
る。また、粉砕品は粒度分布の幅の狭い精緻なも
のが得られる。 To solve these problems, when the classifier of the present invention is used, the particle size of the crushed product is made smaller and the powder in the classification chamber is sufficiently dispersed, so such aggregates can be loosened and fine powder can be obtained. Since the powder is classified as fine powder, the grinding efficiency can be further improved. In addition, a refined product with a narrow particle size distribution can be obtained as a pulverized product.
以下、本発明を実施例に基いてより具体的に説
明する。 Hereinafter, the present invention will be explained more specifically based on Examples.
［実施例］
実施例 １
スチレンアクリル樹脂 100重量部
磁性体 60重量部
荷電制御剤 ２重量部
低分子量ポリプロピレン樹脂 ４重量部
上記の配合よりなるトナー材料を加熱混練し、
それを冷却後、ハンマーミルで粗粉砕して得た粉
体材料を第１図及び第２図に示した気流分級機に
投入し、分離粗粉を該分級機に接続した超音速ジ
エツトミル−10型（日本ニユーマチツク工業社
製）に流入させ微粉砕（粉砕用ジエツトエアー圧
力６Kgｆ／cm2）を行い、微粉砕された粉体材料を
再び粗粉砕して得た粉体材料とともに該分級機に
投入し、分離微粉を微粉砕製品として得た。[Examples] Example 1 Styrene acrylic resin 100 parts by weight Magnetic material 60 parts by weight Charge control agent 2 parts by weight Low molecular weight polypropylene resin 4 parts by weight A toner material consisting of the above formulation was heated and kneaded,
After cooling it, the powder material obtained by coarsely pulverizing it with a hammer mill was put into the air classifier shown in Figures 1 and 2, and the separated coarse powder was transferred to a supersonic jet mill-10 connected to the classifier. The powder material is flowed into a mold (manufactured by Nihon Neumatic Kogyo Co., Ltd.) and finely pulverized (jet air pressure for crushing is 6 kgf/cm 2 ), and the finely pulverized powder material is fed into the classifier together with the powder material obtained by coarsely pulverizing it again. A separated fine powder was obtained as a finely ground product.
その結果、平均粒径14.3μm，20μm以上頻度6.2
重量％の微粉砕製品が得られた。 As a result, the average particle size was 14.3μm, and the frequency of 20μm or more was 6.2
A finely ground product of % by weight was obtained.
実施例 ２
実施例１と同じ材料を実施例１と同じ供給量
で、実施例１と同じ超音速ジツトミルを第５図に
示した気流分級機に接続したものに投入し、粉砕
用ジエツトエアー圧力を６Kgｆ／cm2で微粉砕製品
を得た。Example 2 The same material as in Example 1 was fed at the same amount as in Example 1, and the same supersonic jet mill as in Example 1 was connected to the air classifier shown in Fig. 5, and the jet air pressure for pulverization was adjusted. A finely ground product was obtained at 6 Kgf/cm 2 .
その結果、平均粒径12.6μm，20μm以上頻度1.8
重量％の微粉砕製品が得られた。 As a result, the average particle size was 12.6 μm, and the frequency of 20 μm or more was 1.8
A finely ground product of % by weight was obtained.
なお、第５図に示した気流分級機は第２図に示
した微粉排出口径を分級板の外直径に対して20％
にしたものである。 In addition, for the air classifier shown in Figure 5, the fine powder outlet diameter shown in Figure 2 is set to 20% of the outside diameter of the classification plate.
This is what I did.
実施例 ３
実施例１と同じ材料を実施例１と同じ供給量で
実施例１と同じ超音速ジツトミルを第６図に示し
た気流分級機に接続したものに投入し、粉砕用ジ
エツトエアー圧力を６Kgｆ／cm2で微粉砕製品を得
た。Example 3 The same material as in Example 1 was fed at the same feed rate as in Example 1 into the same supersonic jitter mill as in Example 1 connected to the air classifier shown in Fig. 6, and the jet air pressure for crushing was set to 6 kgf. A finely ground product was obtained at /cm 2 .
その結果、平均粒径12.1μm，20μm以上頻度1.5
重量％の微粉砕製品が得られた。 As a result, the average particle size was 12.1 μm, and the frequency of 20 μm or more was 1.5
A finely ground product of % by weight was obtained.
なお、第６図に示した気流分級機は第２図に示
した分級板の傾斜角度を50゜にしたものである。 The air classifier shown in FIG. 6 is the same as the one shown in FIG. 2, with the classification plate tilted at an angle of 50°.
実施例 ４
実施例１と同じ材料を実施例１と同じ供給量で
実施例１と同じ超音速ジツトミルを第７図に示し
た気流分級機に接続したものに投入し、粉砕用ジ
エツトエアー圧力を６Kgｆ／cm2で微粉砕製品を得
た。Example 4 The same material as in Example 1 was fed at the same feed rate as in Example 1 into the same supersonic jitter mill as in Example 1 connected to the air classifier shown in Fig. 7, and the jet air pressure for crushing was set to 6 kgf. A finely ground product was obtained at /cm 2 .
その結果、平均粒径10.4μm，20μm以上頻度０
重量％の微粉砕製品が得られた。 As a result, the average particle size was 10.4μm, and there was no frequency of 20μm or more.
A finely ground product of % by weight was obtained.
なお、第７図に示した気流分級機は第２図に示
した微粉排出口径を分級板の外直径に対して20％
にし、第２図に示した分級板の傾斜角度を50゜に
したものである。 Note that the air classifier shown in Figure 7 has a fine powder outlet diameter shown in Figure 2 that is 20% of the outside diameter of the classification plate.
The angle of inclination of the classification plate shown in Fig. 2 is 50°.
実施例 ５
実施例１と同じ材料を超音速ジツトミルを−
５型（日本ニユーマチツク工業社製）を第７図に
示した気流分級機に接続したものに投入し、粉砕
用ジエツトエアー圧力を６Kgｆ／cm2で微粉砕製品
を得た。Example 5 The same material as Example 1 was processed using a supersonic jist mill.
A model 5 (manufactured by Nihon Neumatic Kogyo Co., Ltd.) connected to the air classifier shown in FIG. 7 was charged, and a finely pulverized product was obtained at a jet air pressure of 6 kgf/cm 2 for pulverization.
その結果、平均粒径4.6μm，10μm以上頻度0.1
重量％の微粉砕製品が得られた。 As a result, the average particle size was 4.6μm, and the frequency of 10μm or more was 0.1
A finely ground product of % by weight was obtained.
なお、ここで用いた気流分級機は分級室径にお
いて実施例４で用いた分級機の分級室径の80％に
縮小したものである。 The air classifier used here had a classification chamber diameter reduced to 80% of the classification chamber diameter of the classifier used in Example 4.
比較例 １
実施例１と同じ材料を実施例１と同じ供給量で
実施例１と同じ超音速ジツトミルを第８図及び第
９図に示したような従来の気流分級機に接続した
ものに投入し、粉砕用ジエツトエアー圧力を６Kg
ｆ／cm2で微粉砕製品を得たところ、平均粒径
18.3μm，20μm以上頻度12.1重量％の粗粉側に幅
広な粒度分布であつた。Comparative Example 1 The same material as in Example 1 and the same feed rate as in Example 1 were fed into the same supersonic jitter mill as in Example 1 connected to a conventional air classifier as shown in Figs. 8 and 9. and set the jet air pressure for crushing to 6 kg.
When a finely pulverized product was obtained at f/ cm2 , the average particle size was
There was a wide particle size distribution on the coarse powder side with a frequency of 18.3 μm and 20 μm or more at 12.1% by weight.
比較例 ２
実施例１と同じ材料を実施例５と同じ供給量で
実施例５と同じ超音速ジツトミルを第８図及び第
９図に示したような従来の気流分級機であり、実
施例５と同じ分級室径にした分級機に接続したも
のに投入し、粉砕用ジエツトエアー圧力を６Kg
ｆ／cm2で微粉砕製品を得たところ、その粒度分布
は平均粒径5.8μm，10.8μm以上頻度5.0重量％で
あつた。Comparative Example 2 The same material as in Example 1 was supplied in the same amount as in Example 5, and the same supersonic jet mill as in Example 5 was used as a conventional air classifier as shown in FIGS. 8 and 9. into a classifier connected to a classifier with the same classification chamber diameter, and the jet air pressure for crushing was set at 6 kg.
When a finely pulverized product was obtained at f/cm 2 , the particle size distribution was as follows: average particle size was 5.8 μm, and the frequency of particles of 10.8 μm or more was 5.0% by weight.
［発明の効果］
以上説明したように、案内板の径を大きくする
ことによつて供給溝の径を大きくすること、分級
室の上部周囲に粉体材料を旋回流により分散させ
るための空気流入手段を設けること、さらに、微
粉排出口の口径を小さくすることおよび／または
分級板の傾斜を急勾配にすることにより、分離粒
子径の小さい、精緻な分布の分級製品を効率良く
得ることができる。[Effects of the invention] As explained above, the diameter of the supply groove can be increased by increasing the diameter of the guide plate, and the air can be introduced around the upper part of the classification chamber to disperse the powder material by swirling flow. By providing the means, further reducing the diameter of the fine powder outlet and/or making the slope of the classification plate steeper, it is possible to efficiently obtain a classified product with a small separated particle size and a fine distribution. .
第１図は、本発明に係る装置を実施した気流分
級機の外表面図、第２図、第５図、第６図及び第
７図はそれぞれ縦断正面図を示し、第８図及び第
９図はそれぞれ従来例の気流分級機の外表面図、
縦断正面図であり、第３図は、第１図、第２図の
−視断面図であり、第４図は第１図、第２
図、第８図及び第９図の−視断面図であり、
第１０図は、本発明に係る装置を粉砕システムに
適用したフローチヤート図である。
１……本体ケーシング、２……下部ケーシン
グ、３……ホツパー、４……分級室、５……分級
板、６…粗粉排出溝、７……微粉排出口、８……
第２空気流入口、９……供給筒、１０……案内
筒、１１……供給溝、１２……第１空気流入口、
１３……分散ルーバー、１４……分級ルーバー、
１５……案内板、１６……微粉排出管。
FIG. 1 is an external surface view of an air classifier implementing the device according to the present invention, FIGS. 2, 5, 6, and 7 are longitudinal sectional front views, and FIGS. 8 and 9 are The figures are an external view of a conventional air classifier, and
FIG. 3 is a vertical sectional front view, FIG. 3 is a cross-sectional view of FIG. 1 and FIG. 2, and FIG.
FIG. 8 is a cross-sectional view of FIGS.
FIG. 10 is a flow chart in which the apparatus according to the present invention is applied to a crushing system. 1...Body casing, 2...Lower casing, 3...Hopper, 4...Classifying chamber, 5...Classifying plate, 6...Coarse powder discharge groove, 7...Fine powder discharge port, 8...
2nd air inlet, 9... supply tube, 10... guide tube, 11... supply groove, 12... first air inlet,
13...dispersion louver, 14...classification louver,
15...Guide plate, 16...Fine powder discharge pipe.
Claims (1)
内板を設け、該案内板の下縁外周囲に粉体材料を
分級室に供給するための供給溝を形成し、該分級
室の下部には中央部が高くなる傾斜状の分級板を
設け、該分級板の下縁外周囲には風力分級された
粗粉を排出するための粗粉排出口を形成し、該分
級板の中央部には風力分級された微粉を排出する
ための微粉排出口が具備されており、該案内板の
径を大きくすることによつて供給溝の径を大きく
し、微粉排出口の口径が分級板の外直径に対して
10％以上25％以下であり、 該分級室の上部周囲には、供給された粉体材料
をエアの旋回流により分散させるために、分級室
上部に外気からエアを導入するための第１空気流
入口を有する流入路を複数のルーバーで形成して
いる第１空気流入手段が具備されており、 該分級室の下部周囲には、分散された粉体材料
を風力分級するためのエアの旋回流を生じさせる
ために、分級室下部に外気からエアを導入するた
めの第２空気流入口を有する流入路を複数のルー
バーで形成している第２空気流入手段が具備され
ていることを特徴とする気流分級機。 ２ 該分級板の傾斜角度が30゜以上60゜以下である
ことを特徴とする請求項第１項に記載の気流分級
機。 ３ 外気から第１空気流入手段を経由して流入さ
れるエアの風速は、外気から第２空気流入手段を
経由して流入されるエアの風速と同等または遅く
なるように流入路が調整されている請求項第１項
又は第２項に記載の気流分級機。 ４ 分級室の上部に中央部が高くなる傾斜状の案
内板を設け、該案内板の下縁外周囲に分級室に粉
体材料を供給するための供給溝を形成し、該分級
室の下部には中央部が高くなる傾斜状の分級板を
設け、該分級板の下縁外周囲には風力分級された
粗粉を排出するための粗粉排出口を形成し、該分
級板の中央部には風力分級された微粉を排出する
ための微粉排出口が具備されており、該案内板の
径を大きくすることによつて供給溝の径を大きく
し、該分級板の傾斜角度を30゜以上60゜以下にし、 該分級室の上部周囲には、供給された粉体材料
をエアの旋回流により分散させるために、分級室
上部に外気からエアを導入するための第１空気流
入口を有する流入路を複数のルーバーで形成して
いる第１空気流入手段が具備されており、 該分級室の下部周囲には、分散された粉体を風
力分級するためのエアの旋回流を生じさせるため
に、分級室下部に外気からエアを導入するための
第２空気流入口を有する流入路を複数のルーバー
で形成している第２空気流入手段が具備されてい
ることを特徴とする気流分級機。 ５ 外気から第１空気流入手段を経由して流入さ
れるエアの風速は、外気から第２空気流入手段を
経由して流入されるエアの風速と同等または遅く
なるように流入路が調整されている請求項第４項
に記載の気流分級機。[Claims] 1. An inclined guide plate with a high central portion is provided in the upper part of the classification chamber, and a supply groove for supplying powder material to the classification chamber is formed around the lower edge of the guide plate. , a slanted classification plate with a high central portion is provided at the bottom of the classification chamber, and a coarse powder discharge port is formed around the lower edge of the classification plate for discharging coarse powder classified by wind; The central part of the classification plate is equipped with a fine powder discharge port for discharging the fine powder classified by the wind.By increasing the diameter of the guide plate, the diameter of the supply groove is increased, and the fine powder discharge port is The diameter of is relative to the outside diameter of the classification plate.
10% or more and 25% or less, and around the upper part of the classification chamber there is a first air supply for introducing air from the outside into the upper part of the classification chamber in order to disperse the supplied powder material by a swirling flow of air. A first air inlet means is provided in which a plurality of louvers form an inlet passage having an inlet, and air swirling is provided around the lower part of the classification chamber for wind-classifying the dispersed powder material. In order to generate a flow, a second air inlet means is provided in the lower part of the classification chamber, the second air inlet having a second air inlet for introducing air from the outside air, formed by a plurality of louvers. Air flow classifier. 2. The air classifier according to claim 1, wherein the inclination angle of the classification plate is 30° or more and 60° or less. 3. The inflow path is adjusted so that the wind speed of the air flowing in from the outside air via the first air inflow means is equal to or slower than the wind speed of the air flowing in from the outside air via the second air inflow means. The air classifier according to claim 1 or 2. 4. A sloping guide plate with a high center part is provided in the upper part of the classification chamber, a supply groove for supplying powder material to the classification chamber is formed around the lower edge of the guide plate, and a supply groove for supplying powder material to the classification chamber is provided in the lower part of the classification chamber. is provided with an inclined classification plate that is higher at the center, and a coarse powder discharge port is formed around the lower edge of the classification plate for discharging the coarse powder that has been air-classified. is equipped with a fine powder discharge port for discharging the fine powder that has been classified by air, and by increasing the diameter of the guide plate, the diameter of the supply groove is increased, and the inclination angle of the classification plate is increased to 30°. 60° or less, and a first air inlet is provided around the upper part of the classification chamber to introduce air from outside air into the upper part of the classification chamber in order to disperse the supplied powder material by a swirling flow of air. The first air inflow means is provided with an inflow path formed by a plurality of louvers, and a swirling flow of air is generated around the lower part of the classification chamber for wind-classifying the dispersed powder. For this purpose, a second air inflow means is provided in which a plurality of louvers form an inflow path having a second air inlet for introducing air from outside air into the lower part of the classification chamber. Machine. 5. The inflow path is adjusted so that the wind speed of the air flowing in from the outside air via the first air inflow means is equal to or slower than the wind speed of the air flowing in from the outside air via the second air inflow means. The air classifier according to claim 4.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63071766A JPH01245869A (en) | 1988-03-28 | 1988-03-28 | Pneumatic classifier |
| KR1019890001287A KR930004539B1 (en) | 1988-02-09 | 1989-02-03 | Gas current classifying separator |
| EP89102158A EP0328074B1 (en) | 1988-02-09 | 1989-02-08 | Gas current classifying separator |
| DE89102158T DE68911161T2 (en) | 1988-02-09 | 1989-02-08 | Gas flow classifier. |
| FR898901641A FR2626788B1 (en) | 1988-02-09 | 1989-02-08 | SEPARATOR FOR THE CLASSIFICATION OF A POWDER BY AIR STREAM |
| CN 89102002 CN1013031B (en) | 1988-02-09 | 1989-02-10 | Gas current classifying separator |
| US07/771,527 US5165549A (en) | 1988-02-09 | 1991-10-07 | Gas current classifying separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63071766A JPH01245869A (en) | 1988-03-28 | 1988-03-28 | Pneumatic classifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01245869A JPH01245869A (en) | 1989-10-02 |
| JPH051073B2 true JPH051073B2 (en) | 1993-01-07 |
Family
ID=13469998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63071766A Granted JPH01245869A (en) | 1988-02-09 | 1988-03-28 | Pneumatic classifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01245869A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4644061B2 (en) * | 2004-07-20 | 2011-03-02 | 株式会社リコー | Airflow type classifier, small particle size manufacturing apparatus, and small particle size manufacturing method |
| JP6077326B2 (en) * | 2013-02-15 | 2017-02-08 | 国立大学法人広島大学 | Cyclone classifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5720298U (en) * | 1980-07-07 | 1982-02-02 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54122477U (en) * | 1978-02-16 | 1979-08-27 | ||
| JPH031098Y2 (en) * | 1986-05-19 | 1991-01-14 |
-
1988
- 1988-03-28 JP JP63071766A patent/JPH01245869A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5720298U (en) * | 1980-07-07 | 1982-02-02 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01245869A (en) | 1989-10-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |